I lived in greater LA Calif till I was 20 and was a very sickly kid. Missed long periods of school and had to miss a whole year when I was 13. Always complained about the brick on my chest when smog was real bad. Left town when I was twenty and got healthier every day I was gone. No real health problems till 48. Lived in pretty clean air all those years. Did go back and spend about a month shortly before coming down with poly myalgia rheumatica at 48. It came on in an instant. Any ideas about a connection between living in very bad air quality communities and being sick?